//
//  RevealViewController.swift
//  RevealStack
//
//  Created by Keith Harrison http://useyourloaf.com
//  Copyright (c) 2017 Keith Harrison. All rights reserved.
//
//  Redistribution and use in source and binary forms, with or without
//  modification, are permitted provided that the following conditions are met:
//
//  1. Redistributions of source code must retain the above copyright
//  notice, this list of conditions and the following disclaimer.
//
//  2. Redistributions in binary form must reproduce the above copyright
//  notice, this list of conditions and the following disclaimer in the
//  documentation and/or other materials provided with the distribution.
//
//  3. Neither the name of the copyright holder nor the names of its
//  contributors may be used to endorse or promote products derived from
//  this software without specific prior written permission.
//
//  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
//  AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
//  IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
//  ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
//  LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
//  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
//  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
//  INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
//  CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
//  ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
//  POSSIBILITY OF SUCH DAMAGE.

import UIKit

class RevealViewController: UIViewController {
    @IBOutlet private var rootStackView: UIStackView!
    @IBOutlet private var imageStackView: UIStackView!
    @IBOutlet private var revealSwitch: UISwitch!

    private lazy var coverView: UIView = {
        let view = UIView()
        view.backgroundColor = .yellow
        return view
    }()

    private lazy var backgroundView: UIView = {
        let view = UIView()
        view.backgroundColor = .purple
        view.layer.cornerRadius = 10.0
        return view
    }()

    @IBAction func revealAction(_ sender: UISwitch) {
        UIView.animate(withDuration: 0.25) {
            self.configureReveal()
        }
    }

    override func viewDidLoad() {
        super.viewDidLoad()
        pinBackground(backgroundView, to: rootStackView)
        pinForeground(coverView, to: imageStackView)
        configureReveal()
    }

    private func configureReveal() {
        coverView.alpha = revealSwitch.isOn ? 0 : 1.0
    }

    private func pinBackground(_ view: UIView, to stackView: UIStackView) {
        view.translatesAutoresizingMaskIntoConstraints = false
        stackView.insertSubview(view, at: 0)
        view.pin(to: stackView)
    }

    private func pinForeground(_ view: UIView, to stackView: UIStackView) {
        view.translatesAutoresizingMaskIntoConstraints = false
        stackView.addSubview(view)
        view.pin(to: stackView)
    }
}
